Means for preventing lost motion.



No. 740,594. PATENTED 00w. 6, 1903.

G. W. SGHOOK, Y MEANS FOR PREVENTING LOST MOTION.

APPLICATION FILED MAR. 31 1903.

N0 MODEL.

WK" W UNITED ST T S- Patented October 6, 1903.

PAT NT OFFICE.

MEANS FOR PREVENTING LOST MOTION.-

SPECIFICATION forming part of Letters Patent No. 740,594, dated October 6, 1903..

Application filed March 31, 1903.

To all whom it may concern.-

Be it known that I, GEORGE W. SCHOGK,a citizen of the United States, residing at South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Means for Preventing Lost Motion; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable oth-,

ers skilled in the art to which it appertains to make and use the same.

My invention has relation to improvements in improved means for preventing lost motion at dead-point in mechanism for converting rotary into rectilinear motion; and the object is to provide an improved assemblage or a groupment of parts which will be of simple construction, efiicient in attaining the purpose, and at the same time strong and durable in use. I attain the objects of the invention by the means and mechanism illustrated in the accompanying drawings, to be taken as a part of this specification, and wherein Figure l is a side view of a rota-table cam and a piston-rod or pitman connected by my improved meansj Fig. 2 is a top plan view,

partly in section, showing the antifrictiom roller as engaged in the race of the cam. Fig. 8 is a detail view of the antifriction-roller and supporting-bracket; Fig. 4 is a detail View, on enlarged scale, partly in section, showing the plunger and its buffer-spring.

In the drawings similar references indicate like parts in the several illustrations.

It will be premised that in mechanical move: ments of the kind involved it is well known that the lost motion present under ordinary constructions increases proportionately as the train of connected mechanism is multiplied. It may also be noted that in mechanism requiring accurate adjustment, in which cams and levers are used to convert the movement from one kind to another, it has been found difficult to prevent or-overcome the lostmotion which occurs at opposite points in each stroke or revolution of the mechanism. order to prevent'and overcome this common difficulty, I provide the reciprocating element or member with oppositely-arranged springactuated plungers, which contact yieldingly against the shaft of the rotary memberand by their recoil action take up all lost motion perimeter of the shaft.

Serial No. 150,387. (No model.)

of pitman as same is carried over the deadpoints.

Referring to the drawings, 1 designates a rotatable shaft, on which is mounted and secured to rotate with the shaft a cam-2, having formed at its side face acam-race 3, the walls of which are in'concentric relation.

4: designates the reciprocable rod or pitman, on the end of which is mounted a suitable bracket 5, formed with a socket 6, constituting a bearing,wherein is arranged a bearingstem of a roller 7, extending laterally from the rod 4 and engaging in the cam-race 3 of the cam. The pitman or rod 4 is made with side plates or pieces 8 9, forming a slot through which the cam-shaft loosely projects and between the outer ends of which is secured a bracket 10, wherein is formed a longitudinallyarranged socket 11, wherein is slidingly disposed the stem 12 of a plunger or buffer 13, the stem extending through the end of the bracket and provided with a threaded nut 14. The buffer is formed with a head 15, having a concaved outer face 16 coincident with the A buffer-spring 17 is mounted on the stem of the buffer. At the opposite end of the slotted portion of the pitman is positioned a buffer, which in construction and operation is the duplicate of that above described, and therefore the parts have been designated by the same references.

It will be perceived from the foregoing description, taken in connection with the drawings, that when the rotating member reaches a dead-point in relation to the reciprocating member the buffer will contact with the shaft before the limit of the strokeis reached and the bufier-spring will be gradually depressed, so that when the deadpoint is reached'the force of the spring will be exerted to overcome any lost motion by taking up the play that may exist between the camrace and roller on end of reciprocating rod or pitman. The opposite buffer acts opposite to the other, or, in other words, prevents movement of any kind on the part of reciprocating rod as the roller passes'over the dead-centers.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a mechanism of the kind described,

shaft loosely projects, and formed with sockets at the ends of the slot, buffers slidingly arranged in the sockets, springs in the sockets on the buffers, and an operative connection between the pitman and the cam-race.

Intestimony whereof I affix my signature in presence of two witnesses.

GEO. WV. SOHO CK.

Witnesses:

GEORGE OLTSOH, MAGGIE OLTSCH. 

